How would I use `BottomSheetScaffold` with the nav...

# compose

[Jason Ankers]

How would I use BottomSheetScaffold with the navigation component? My app consists of a typical bottom-tab layout which is using Scaffold bottomBar = { .. } like in the docs, but I want to launch bottom sheets from inside my tabs. The sheets should overlay on top of the bottom tabs and I would like to be able to call navController.navigate(..) to open them. Anyone know of any example apps which have achieved this?

[Ian Lake]

There's nothing built in that would allow you to do that. In theory it would be possible to build a custom Navigator and add that to the NavController, but I don't think there's any good examples of that

[Ian Lake]

Related thread on adding dialog destinations: https://kotlinlang.slack.com/archives/CJLTWPH7S/p1612753388494500?thread_ts=1612753388.494500&cid=CJLTWPH7S

[Ian Lake]

I suspect integration with a BottomSheetScaffold would be similar in scope, but perhaps very little overlap

[Ian Lake]

I'd definitely be supportive of filing a separate issue for it though

[Jason Ankers]

Cool, thanks! I’ll file an issue for it

[Jason Ankers]

Issue created https://issuetracker.google.com/issues/180247978

[Jason Ankers]

@Ian Lake I attempted to create a custom BottomSheetNavigator today, and got about 90% of the way there. I’m stuck on getting content from two destinations to render at the same time (so you can partially swipe the bottom sheet and peek the content behind it). I need to prevent the NavHost from removing the previous screens content when a bottom sheet is launched. Do you have any tips on how this might be achievable?

[Ian Lake]

I don't NavHost as it is written now takes into account destinations that implement the FloatingWindow interface (which any overlay destination should do). That interface would be the one it should check against to know not to remove the previous screen

[Jason Ankers]

Great thanks, I couldn’t implement a custom NavHost because content on regular compose destinations is internal. Any idea if theres plans for NavHost to support FloatingWindow in the near future?

[Ian Lake]

We do accept pull requests: https://github.com/androidx/androidx/blob/androidx-main/CONTRIBUTING.md

[Jason Ankers]

@Ian Lake Do you have a rough idea of how much work would be required to PR this? Is FloatingWindow support a substantial change